RT Journal Article SR Electronic T1 Influenza A: another cause of SIADH? JF BMJ Case Reports FD BMJ Publishing Group Ltd SP bcr-2018-226154 DO 10.1136/bcr-2018-226154 VO 2018 A1 Simon Mifsud A1 Maria Alessandra Zammit A1 Ramon Casha A1 Claudia Fsadni YR 2018 UL http://casereports.bmj.com/content/2018/bcr-2018-226154.abstract AB The syndrome of inappropriate antidiuretic hormone (SIADH) secretion is a frequent cause of hyponatraemia. It is a dilutional hyponatraemia secondary to impaired urinary dilution in the absence of renal disease or any identifiable non-osmotic stimulus known to induce antidiuretic hormone secretion. SIADH can arise secondary to various respiratory tract infections; however, the association between SIADH and influenza A infection is described in only a few cases in the literature. The authors present a case report of influenza A that may have caused a profound SIADH-related hyponatraemia.